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US 8,120,851 B2Granted
Optical material and optical element, diffraction optical element, and stacked type diffraction optical element molded thereof
AssigneeCanon Kabushiki Kaisha
InventorHidefumi Iwasa
Life of this patent
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Abstract
Use of an organic optical material whose Abbe's number (νd) and secondary dispersion (θg,F) satisfy the relationship θg,F≦−2νd×10−3+0.59 provides an optical material which causes reduced optical scattering, the optical material having excellent optical scattering characteristics and secondary dispersion characteristics equivalent to those of a compound in which fine particles of conductive metal oxides such as ITO are dispersed in an organic resin.
Claims4
A stacked type diffraction optical element comprising:
- a first diffraction optical element having a diffraction shape formed on one surface thereof comprising (a) an organic resin and (b) fine particles of a conductive polymer material dispersed into the organic resin, wherein the Abbe's number (νd) and a secondary dispersion (θg,F) meet a relation:
- θg,F≦−2νd×10−3+0.59, and
- wherein an average diameter of the fine particles is 2-300 nm;
- and
- a second diffraction optical element, the Abbe's number of which is larger than the Abbe's number of the first diffraction optical element, having a diffraction shape formed on one surface thereof,
- wherein a diffraction plane of the diffraction shape of the first diffraction optical element and a diffraction plane of the diffraction shape of the second diffraction optical element are disposed in opposition to each other to form a gap therebetween,
- wherein a difference between a refractive index of the organic resin and a refractive index of the conductive polymer material is ±0.05, and
- wherein the conductive polymer material is poly 3,4-ethylenedioxythiophene/polystyrenesulfonic acid (PEDOT/PSS).
5 more elements
A stacked type diffraction optical element comprising:
- a first diffraction optical element having a diffraction shape formed on one surface thereof comprising (a) an organic resin and (b) fine particles of a conductive polymer material dispersed into the organic resin, wherein the Abbe's number (νd) and a secondary dispersion (θg,F) meet a relation:
- θg,F≦−2νd×10−3+0.59, and
- wherein an average diameter of the fine particles is 2-300 nm;
- and
- a second diffraction optical element, the Abbe's number of which is larger than the Abbe's number of the first diffraction optical element, and refractive index of which is larger than the refractive index of the first diffraction optical element, having a diffraction shape formed on one surface thereof,
- wherein a diffraction plane of the diffraction shape of the first diffraction optical element is disposed on a diffraction plane of the diffraction shape of the second diffraction optical element so as not to form a gap therebetween,
- wherein a difference between a refractive index of the organic resin and a refractive index of the conductive polymer material is ±0.05, and
- wherein the conductive polymer material is poly 3,4-ethylenedioxythiophene/polystyrenesulfonic acid (PEDOT/PSS).
5 more elements
Dependencies are inferred from the claim text.